body{
    margin: 0;
    padding: 0;
}
.center{
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: linear-gradient(15deg,#13547a,#80d0c7);
}
.center span{
    position: absolute;
    border-left: 5px solid #fff;
    border-right: 5px solid #fff;
    border-top:5px solid transparent ;
    border-bottom:5px solid transparent ;
    border-radius: 50%;
    animation: rr 2s ease infinite;

}
.center span:nth-child(1){
    width: 70px;
    height: 70px;
   
}
.center span:nth-child(2){
    width: 90px;
    height: 90px;
    animation-delay: 0.1s;
}
.center span:nth-child(3){
    width: 110px;
    height: 110px;
    animation-delay: 0.2s;
}
.center span:nth-child(4){
    width: 130px;
    height: 130px;
    animation-delay: 0.3s;
}
@keyframes rr{
    /* 25%{
        transform: rotate(180deg);
    } */
    50%{
        transform: rotate(360deg);
    }
    /* 75%{
        transform: rotate(180deg);
    } */
    100%{
        transform: rotate(0deg);
    }
}